content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2012, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
   * Other names may be trademarks of their respective owners.]
   *
   * -------------------
   * XYAreaRenderer.java
   * -------------------
   * (C) Copyright 2002-2012, by Hari and Contributors.
   *
   * Original Author:  Hari (ourhari@hotmail.com);
   * Contributor(s):   David Gilbert (for Object Refinery Limited);
   *                   Richard Atkinson;
   *                   Christian W. Zuckschwerdt;
   *                   Martin Krauskopf;
   *
   * Changes:
   * --------
   * 03-Apr-2002 : Version 1, contributed by Hari.  This class is based on the
   *               StandardXYItemRenderer class (DG);
   * 09-Apr-2002 : Removed the translated zero from the drawItem method -
   *               overridden the initialise() method to calculate it (DG);
   * 30-May-2002 : Added tool tip generator to constructor to match super
   *               class (DG);
   * 25-Jun-2002 : Removed unnecessary local variable (DG);
   * 05-Aug-2002 : Small modification to drawItem method to support URLs for HTML
   *               image maps (RA);
   * 01-Oct-2002 : Fixed errors reported by Checkstyle (DG);
   * 07-Nov-2002 : Renamed AreaXYItemRenderer --> XYAreaRenderer (DG);
   * 25-Mar-2003 : Implemented Serializable (DG);
   * 01-May-2003 : Modified drawItem() method signature (DG);
   * 27-Jul-2003 : Made line and polygon properties protected rather than
   *               private (RA);
   * 30-Jul-2003 : Modified entity constructor (CZ);
   * 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
   * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
   * 07-Oct-2003 : Added renderer state (DG);
   * 08-Dec-2003 : Modified hotspot for chart entity (DG);
   * 10-Feb-2004 : Changed the drawItem() method to make cut-and-paste overriding
   *               easier.  Also moved state class into this class (DG);
   * 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState.  Renamed
   *               XYToolTipGenerator --> XYItemLabelGenerator (DG);
   * 15-Jul-2004 : Switched getX() with getXValue() and getY() with
   *               getYValue() (DG);
   * 11-Nov-2004 : Now uses ShapeUtilities to translate shapes (DG);
   * 19-Jan-2005 : Now accesses primitives only from dataset (DG);
   * 21-Mar-2005 : Override getLegendItem() and equals() methods (DG);
   * 20-Apr-2005 : Use generators for legend tooltips and URLs (DG);
   * ------------- JFREECHART 1.0.x ---------------------------------------------
   * 06-Feb-2007 : Fixed bug 1086307, crosshairs with multiple axes (DG);
   * 14-Feb-2007 : Fixed bug in clone() (DG);
   * 20-Apr-2007 : Updated getLegendItem() for renderer change (DG);
   * 04-May-2007 : Set processVisibleItemsOnly flag to false (DG);
   * 17-May-2007 : Set datasetIndex and seriesIndex in getLegendItem() (DG);
   * 18-May-2007 : Set dataset and seriesKey for LegendItem (DG);
   * 17-Jun-2008 : Apply legend font and paint attributes (DG);
   * 31-Dec-2008 : Fix for bug 2471906 - dashed outlines performance issue (DG);
   * 11-Jun-2009 : Added a useFillPaint flag and a GradientPaintTransformer for
   *               the paint under the series (DG);
   * 06-Oct-2011 : Avoid GeneralPath methods requiring Java 1.5 (MK);
   * 16-Jun-2012 : Removed JCommon dependencies (DG);
   *
   */
  
  package org.jfree.chart.renderer.xy;
  
  import java.awt.BasicStroke;
  import java.awt.GradientPaint;
  import java.awt.Graphics2D;
  import java.awt.Paint;
  import java.awt.Shape;
  import java.awt.Stroke;
  import java.awt.geom.Area;
  import java.awt.geom.GeneralPath;
  import java.awt.geom.Line2D;
  import java.awt.geom.Rectangle2D;
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  
  import org.jfree.chart.HashUtilities;
  import org.jfree.chart.LegendItem;
  import org.jfree.chart.axis.ValueAxis;
  import org.jfree.chart.ui.GradientPaintTransformer;
  import org.jfree.chart.ui.StandardGradientPaintTransformer;
  import org.jfree.chart.util.PublicCloneable;
  import org.jfree.chart.util.ShapeUtilities;
  import org.jfree.chart.entity.EntityCollection;
  import org.jfree.chart.event.RendererChangeEvent;
  import org.jfree.chart.labels.XYSeriesLabelGenerator;
  import org.jfree.chart.labels.XYToolTipGenerator;
  import org.jfree.chart.plot.CrosshairState;
  import org.jfree.chart.plot.PlotOrientation;
  import org.jfree.chart.plot.PlotRenderingInfo;
  import org.jfree.chart.plot.XYPlot;
  import org.jfree.chart.urls.XYURLGenerator;
  import org.jfree.chart.util.SerialUtilities;
  import org.jfree.data.xy.XYDataset;
  
  /**
   * Area item renderer for an {@link XYPlot}.  This class can draw (a) shapes at
   * each point, or (b) lines between points, or (c) both shapes and lines,
   * or (d) filled areas, or (e) filled areas and shapes. The example shown here
   * is generated by the <code>XYAreaRendererDemo1.java</code> program included
   * in the JFreeChart demo collection:
   * <br><br>
   * <img src="../../../../../images/XYAreaRendererSample.png"
   * alt="XYAreaRendererSample.png" />
   */
  public class XYAreaRenderer extends AbstractXYItemRenderer
          implements XYItemRenderer, PublicCloneable {
  
      /** For serialization. */
      private static final long serialVersionUID = -4481971353973876747L;
  
      /**
       * A state object used by this renderer.
       */
      static class XYAreaRendererState extends XYItemRendererState {
  
          /** Working storage for the area under one series. */
          public GeneralPath area;
  
          /** Working line that can be recycled. */
          public Line2D line;
  
          /**
           * Creates a new state.
           *
           * @param info  the plot rendering info.
           */
          public XYAreaRendererState(PlotRenderingInfo info) {
              super(info);
              this.area = new GeneralPath();
              this.line = new Line2D.Double();
          }
  
      }
  
      /** Useful constant for specifying the type of rendering (shapes only). */
      public static final int SHAPES = 1;
  
      /** Useful constant for specifying the type of rendering (lines only). */
      public static final int LINES = 2;
  
      /**
       * Useful constant for specifying the type of rendering (shapes and lines).
       */
      public static final int SHAPES_AND_LINES = 3;
  
      /** Useful constant for specifying the type of rendering (area only). */
      public static final int AREA = 4;
  
      /**
       * Useful constant for specifying the type of rendering (area and shapes).
       */
      public static final int AREA_AND_SHAPES = 5;
  
      /** A flag indicating whether or not shapes are drawn at each XY point. */
      private boolean plotShapes;
  
      /** A flag indicating whether or not lines are drawn between XY points. */
      private boolean plotLines;
  
      /** A flag indicating whether or not Area are drawn at each XY point. */
      private boolean plotArea;
  
      /** A flag that controls whether or not the outline is shown. */
      private boolean showOutline;
  
      /**
       * The shape used to represent an area in each legend item (this should
       * never be <code>null</code>).
       */
      private transient Shape legendArea;
  
      /**
       * A flag that can be set to specify that the fill paint should be used
       * to fill the area under the renderer.
       *
       * @since 1.0.14
       */
      private boolean useFillPaint;
  
      /**
       * A transformer that is applied to the paint used to fill under the
       * area *if* it is an instance of GradientPaint.
       *
       * @since 1.0.14
       */
      private GradientPaintTransformer gradientTransformer;
  
      /**
       * Constructs a new renderer.
       */
      public XYAreaRenderer() {
          this(AREA);
      }
  
      /**
       * Constructs a new renderer.
       *
       * @param type  the type of the renderer.
       */
      public XYAreaRenderer(int type) {
          this(type, null, null);
      }
  
      /**
       * Constructs a new renderer.  To specify the type of renderer, use one of
       * the constants: <code>SHAPES</code>, <code>LINES</code>,
       * <code>SHAPES_AND_LINES</code>, <code>AREA</code> or
       * <code>AREA_AND_SHAPES</code>.
       *
       * @param type  the type of renderer.
       * @param toolTipGenerator  the tool tip generator to use
       *                          (<code>null</code> permitted).
       * @param urlGenerator  the URL generator (<code>null</code> permitted).
       */
      public XYAreaRenderer(int type, XYToolTipGenerator toolTipGenerator,
                            XYURLGenerator urlGenerator) {
  
          super();
          setDefaultToolTipGenerator(toolTipGenerator);
          setURLGenerator(urlGenerator);
  
          if (type == SHAPES) {
              this.plotShapes = true;
          }
          if (type == LINES) {
              this.plotLines = true;
          }
          if (type == SHAPES_AND_LINES) {
              this.plotShapes = true;
              this.plotLines = true;
          }
          if (type == AREA) {
              this.plotArea = true;
          }
          if (type == AREA_AND_SHAPES) {
              this.plotArea = true;
              this.plotShapes = true;
          }
          this.showOutline = false;
          GeneralPath area = new GeneralPath();
          area.moveTo(0.0f, -4.0f);
          area.lineTo(3.0f, -2.0f);
          area.lineTo(4.0f, 4.0f);
          area.lineTo(-4.0f, 4.0f);
          area.lineTo(-3.0f, -2.0f);
          area.closePath();
          this.legendArea = area;
          this.useFillPaint = false;
          this.gradientTransformer = new StandardGradientPaintTransformer();
      }
  
      /**
       * Returns true if shapes are being plotted by the renderer.
       *
       * @return <code>true</code> if shapes are being plotted by the renderer.
       */
      public boolean getPlotShapes() {
          return this.plotShapes;
      }
  
      /**
       * Returns true if lines are being plotted by the renderer.
       *
       * @return <code>true</code> if lines are being plotted by the renderer.
       */
      public boolean getPlotLines() {
          return this.plotLines;
      }
  
      /**
       * Returns true if Area is being plotted by the renderer.
       *
       * @return <code>true</code> if Area is being plotted by the renderer.
       */
      public boolean getPlotArea() {
          return this.plotArea;
      }
  
      /**
       * Returns a flag that controls whether or not outlines of the areas are
       * drawn.
       *
       * @return The flag.
       *
       * @see #setOutline(boolean)
       */
      public boolean isOutline() {
          return this.showOutline;
      }
  
      /**
       * Sets a flag that controls whether or not outlines of the areas are drawn
       * and sends a {@link RendererChangeEvent} to all registered listeners.
       *
       * @param show  the flag.
       *
       * @see #isOutline()
       */
      public void setOutline(boolean show) {
          this.showOutline = show;
          fireChangeEvent();
      }
  
      /**
       * Returns the shape used to represent an area in the legend.
       *
       * @return The legend area (never <code>null</code>).
       */
      public Shape getLegendArea() {
          return this.legendArea;
      }
  
      /**
       * Sets the shape used as an area in each legend item and sends a
       * {@link RendererChangeEvent} to all registered listeners.
       *
       * @param area  the area (<code>null</code> not permitted).
       */
      public void setLegendArea(Shape area) {
          if (area == null) {
              throw new IllegalArgumentException("Null 'area' argument.");
          }
          this.legendArea = area;
          fireChangeEvent();
      }
  
      /**
       * Returns the flag that controls whether the series fill paint is used to
       * fill the area under the line.
       *
       * @return A boolean.
       *
       * @since 1.0.14
       */
      public boolean getUseFillPaint() {
          return this.useFillPaint;
      }
  
      /**
       * Sets the flag that controls whether or not the series fill paint is
       * used to fill the area under the line and sends a
       * {@link RendererChangeEvent} to all listeners.
       *
       * @param use  the new flag value.
       *
       * @since 1.0.14
       */
      public void setUseFillPaint(boolean use) {
          this.useFillPaint = use;
          fireChangeEvent();
      }
  
      /**
       * Returns the gradient paint transformer.
       *
       * @return The gradient paint transformer (never <code>null</code>).
       *
       * @since 1.0.14
       */
      public GradientPaintTransformer getGradientTransformer() {
          return this.gradientTransformer;
      }
  
      /**
       * Sets the gradient paint transformer and sends a
       * {@link RendererChangeEvent} to all registered listeners.
       *
       * @param transformer  the transformer (<code>null</code> not permitted).
       *
       * @since 1.0.14
       */
      public void setGradientTransformer(GradientPaintTransformer transformer) {
          if (transformer == null) {
              throw new IllegalArgumentException("Null 'transformer' argument.");
          }
          this.gradientTransformer = transformer;
          fireChangeEvent();
      }
  
      /**
       * Initialises the renderer and returns a state object that should be
       * passed to all subsequent calls to the drawItem() method.
       *
       * @param g2  the graphics device.
       * @param dataArea  the area inside the axes.
       * @param plot  the plot.
       * @param data  the data.
       * @param info  an optional info collection object to return data back to
       *              the caller.
       *
       * @return A state object for use by the renderer.
       */
      @Override
      public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea,
              XYPlot plot, XYDataset data, PlotRenderingInfo info) {
          XYAreaRendererState state = new XYAreaRendererState(info);
  
          // in the rendering process, there is special handling for item
          // zero, so we can't support processing of visible data items only
          state.setProcessVisibleItemsOnly(false);
          return state;
      }
  
      /**
       * Returns a default legend item for the specified series.  Subclasses
       * should override this method to generate customised items.
       *
       * @param datasetIndex  the dataset index (zero-based).
       * @param series  the series index (zero-based).
       *
       * @return A legend item for the series.
       */
      @Override
      public LegendItem getLegendItem(int datasetIndex, int series) {
          LegendItem result = null;
          XYPlot xyplot = getPlot();
          if (xyplot != null) {
              XYDataset dataset = xyplot.getDataset(datasetIndex);
              if (dataset != null) {
                  XYSeriesLabelGenerator lg = getLegendItemLabelGenerator();
                  String label = lg.generateLabel(dataset, series);
                  String description = label;
                  String toolTipText = null;
                  if (getLegendItemToolTipGenerator() != null) {
                      toolTipText = getLegendItemToolTipGenerator().generateLabel(
                              dataset, series);
                  }
                  String urlText = null;
                  if (getLegendItemURLGenerator() != null) {
                      urlText = getLegendItemURLGenerator().generateLabel(
                              dataset, series);
                  }
                  Paint paint = lookupSeriesPaint(series);
                  result = new LegendItem(label, description, toolTipText,
                          urlText, this.legendArea, paint);
                  result.setLabelFont(lookupLegendTextFont(series));
                  Paint labelPaint = lookupLegendTextPaint(series);
                  if (labelPaint != null) {
                      result.setLabelPaint(labelPaint);
                  }
                  result.setDataset(dataset);
                  result.setDatasetIndex(datasetIndex);
                  result.setSeriesKey(dataset.getSeriesKey(series));
                  result.setSeriesIndex(series);
              }
          }
          return result;
      }
  
      /**
       * Draws the visual representation of a single data item.
       *
       * @param g2  the graphics device.
       * @param state  the renderer state.
       * @param dataArea  the area within which the data is being drawn.
       * @param info  collects information about the drawing.
       * @param plot  the plot (can be used to obtain standard color information
       *              etc).
       * @param domainAxis  the domain axis.
       * @param rangeAxis  the range axis.
       * @param dataset  the dataset.
       * @param series  the series index (zero-based).
       * @param item  the item index (zero-based).
       * @param crosshairState  crosshair information for the plot
       *                        (<code>null</code> permitted).
       * @param pass  the pass index.
       */
      @Override
      public void drawItem(Graphics2D g2, XYItemRendererState state,
              Rectangle2D dataArea, PlotRenderingInfo info, XYPlot plot,
              ValueAxis domainAxis, ValueAxis rangeAxis, XYDataset dataset,
              int series, int item, CrosshairState crosshairState, int pass) {
  
          if (!getItemVisible(series, item)) {
              return;
          }
          XYAreaRendererState areaState = (XYAreaRendererState) state;
  
          // get the data point...
          double x1 = dataset.getXValue(series, item);
          double y1 = dataset.getYValue(series, item);
          if (Double.isNaN(y1)) {
              y1 = 0.0;
          }
          double transX1 = domainAxis.valueToJava2D(x1, dataArea,
                  plot.getDomainAxisEdge());
          double transY1 = rangeAxis.valueToJava2D(y1, dataArea,
                  plot.getRangeAxisEdge());
  
          // get the previous point and the next point so we can calculate a
          // "hot spot" for the area (used by the chart entity)...
          int itemCount = dataset.getItemCount(series);
          double x0 = dataset.getXValue(series, Math.max(item - 1, 0));
          double y0 = dataset.getYValue(series, Math.max(item - 1, 0));
          if (Double.isNaN(y0)) {
              y0 = 0.0;
          }
          double transX0 = domainAxis.valueToJava2D(x0, dataArea,
                  plot.getDomainAxisEdge());
          double transY0 = rangeAxis.valueToJava2D(y0, dataArea,
                  plot.getRangeAxisEdge());
  
          double x2 = dataset.getXValue(series, Math.min(item + 1,
                  itemCount - 1));
          double y2 = dataset.getYValue(series, Math.min(item + 1,
                  itemCount - 1));
          if (Double.isNaN(y2)) {
              y2 = 0.0;
          }
          double transX2 = domainAxis.valueToJava2D(x2, dataArea,
                  plot.getDomainAxisEdge());
          double transY2 = rangeAxis.valueToJava2D(y2, dataArea,
                  plot.getRangeAxisEdge());
  
          double transZero = rangeAxis.valueToJava2D(0.0, dataArea,
                  plot.getRangeAxisEdge());
          GeneralPath hotspot = new GeneralPath();
          if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
              moveTo(hotspot, transZero, ((transX0 + transX1) / 2.0));
              lineTo(hotspot, ((transY0 + transY1) / 2.0),
                              ((transX0 + transX1) / 2.0));
              lineTo(hotspot, transY1, transX1);
              lineTo(hotspot, ((transY1 + transY2) / 2.0),
                              ((transX1 + transX2) / 2.0));
              lineTo(hotspot, transZero, ((transX1 + transX2) / 2.0));
          }
          else {  // vertical orientation
              moveTo(hotspot, ((transX0 + transX1) / 2.0), transZero);
              lineTo(hotspot, ((transX0 + transX1) / 2.0),
                              ((transY0 + transY1) / 2.0));
              lineTo(hotspot, transX1, transY1);
              lineTo(hotspot, ((transX1 + transX2) / 2.0),
                              ((transY1 + transY2) / 2.0));
              lineTo(hotspot, ((transX1 + transX2) / 2.0), transZero);
          }
          hotspot.closePath();
  
          if (item == 0) {  // create a new area polygon for the series
              areaState.area = new GeneralPath();
              // the first point is (x, 0)
              double zero = rangeAxis.valueToJava2D(0.0, dataArea,
                      plot.getRangeAxisEdge());
              if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                  moveTo(areaState.area, transX1, zero);
              }
              else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                  moveTo(areaState.area, zero, transX1);
              }
          }
  
          // Add each point to Area (x, y)
          if (plot.getOrientation() == PlotOrientation.VERTICAL) {
              lineTo(areaState.area, transX1, transY1);
          }
          else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
              lineTo(areaState.area, transY1, transX1);
          }
  
          PlotOrientation orientation = plot.getOrientation();
          Paint paint = getItemPaint(series, item);
          Stroke stroke = getItemStroke(series, item);
          g2.setPaint(paint);
          g2.setStroke(stroke);
  
          Shape shape;
          if (getPlotShapes()) {
              shape = getItemShape(series, item);
              if (orientation == PlotOrientation.VERTICAL) {
                  shape = ShapeUtilities.createTranslatedShape(shape, transX1,
                          transY1);
              }
              else if (orientation == PlotOrientation.HORIZONTAL) {
                  shape = ShapeUtilities.createTranslatedShape(shape, transY1,
                          transX1);
              }
              g2.draw(shape);
          }
  
          if (getPlotLines()) {
              if (item > 0) {
                  if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                      areaState.line.setLine(transX0, transY0, transX1, transY1);
                  }
                  else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                      areaState.line.setLine(transY0, transX0, transY1, transX1);
                  }
                  g2.draw(areaState.line);
              }
          }
  
          // Check if the item is the last item for the series.
          // and number of items > 0.  We can't draw an area for a single point.
          if (getPlotArea() && item > 0 && item == (itemCount - 1)) {
  
              if (orientation == PlotOrientation.VERTICAL) {
                  // Add the last point (x,0)
                  lineTo(areaState.area, transX1, transZero);
                  areaState.area.closePath();
              }
              else if (orientation == PlotOrientation.HORIZONTAL) {
                  // Add the last point (x,0)
                  lineTo(areaState.area, transZero, transX1);
                  areaState.area.closePath();
              }
  
              if (this.useFillPaint) {
                  paint = lookupSeriesFillPaint(series);
              }
              if (paint instanceof GradientPaint) {
                  GradientPaint gp = (GradientPaint) paint;
                  GradientPaint adjGP = this.gradientTransformer.transform(gp,
                          dataArea);
                  g2.setPaint(adjGP);
              }
              g2.fill(areaState.area);
  
              // draw an outline around the Area.
              if (isOutline()) {
                  Shape area = areaState.area;
  
                  // Java2D has some issues drawing dashed lines around "large"
                  // geometrical shapes - for example, see bug 6620013 in the
                  // Java bug database.  So, we'll check if the outline is
                  // dashed and, if it is, do our own clipping before drawing
                  // the outline...
                  Stroke outlineStroke = lookupSeriesOutlineStroke(series);
                  if (outlineStroke instanceof BasicStroke) {
                      BasicStroke bs = (BasicStroke) outlineStroke;
                      if (bs.getDashArray() != null) {
                          Area poly = new Area(areaState.area);
                          // we make the clip region slightly larger than the
                          // dataArea so that the clipped edges don't show lines
                          // on the chart
                          Area clip = new Area(new Rectangle2D.Double(
                                  dataArea.getX() - 5.0, dataArea.getY() - 5.0,
                                  dataArea.getWidth() + 10.0,
                                  dataArea.getHeight() + 10.0));
                          poly.intersect(clip);
                          area = poly;
                      }
                  } // end of workaround
  
                  g2.setStroke(outlineStroke);
                  g2.setPaint(lookupSeriesOutlinePaint(series));
                  g2.draw(area);
              }
          }
  
          int domainAxisIndex = plot.getDomainAxisIndex(domainAxis);
          int rangeAxisIndex = plot.getRangeAxisIndex(rangeAxis);
          updateCrosshairValues(crosshairState, x1, y1, domainAxisIndex,
                  rangeAxisIndex, transX1, transY1, orientation);
  
          // collect entity and tool tip information...
          EntityCollection entities = state.getEntityCollection();
          if (entities != null) {
              addEntity(entities, hotspot, dataset, series, item, 0.0, 0.0);
          }
  
      }
  
      /**
       * Returns a clone of the renderer.
       *
       * @return A clone.
       *
       * @throws CloneNotSupportedException  if the renderer cannot be cloned.
       */
      @Override
      public Object clone() throws CloneNotSupportedException {
          XYAreaRenderer clone = (XYAreaRenderer) super.clone();
          clone.legendArea = ShapeUtilities.clone(this.legendArea);
          return clone;
      }
  
      /**
       * Tests this renderer for equality with an arbitrary object.
       *
       * @param obj  the object (<code>null</code> permitted).
       *
       * @return A boolean.
       */
      @Override
      public boolean equals(Object obj) {
          if (obj == this) {
              return true;
          }
          if (!(obj instanceof XYAreaRenderer)) {
              return false;
          }
          XYAreaRenderer that = (XYAreaRenderer) obj;
          if (this.plotArea != that.plotArea) {
              return false;
          }
          if (this.plotLines != that.plotLines) {
              return false;
          }
          if (this.plotShapes != that.plotShapes) {
              return false;
          }
          if (this.showOutline != that.showOutline) {
              return false;
          }
          if (this.useFillPaint != that.useFillPaint) {
              return false;
          }
          if (!this.gradientTransformer.equals(that.gradientTransformer)) {
              return false;
          }
          if (!ShapeUtilities.equal(this.legendArea, that.legendArea)) {
              return false;
          }
          return true;
      }
  
      /**
       * Returns a hash code for this instance.
       *
       * @return A hash code.
       */
      @Override
      public int hashCode() {
          int result = super.hashCode();
          result = HashUtilities.hashCode(result, this.plotArea);
          result = HashUtilities.hashCode(result, this.plotLines);
          result = HashUtilities.hashCode(result, this.plotShapes);
          result = HashUtilities.hashCode(result, this.useFillPaint);
          return result;
      }
  
      /**
       * Provides serialization support.
       *
       * @param stream  the input stream.
       *
       * @throws IOException  if there is an I/O error.
       * @throws ClassNotFoundException  if there is a classpath problem.
       */
      private void readObject(ObjectInputStream stream)
              throws IOException, ClassNotFoundException {
          stream.defaultReadObject();
          this.legendArea = SerialUtilities.readShape(stream);
      }
  
      /**
       * Provides serialization support.
       *
       * @param stream  the output stream.
       *
       * @throws IOException  if there is an I/O error.
       */
      private void writeObject(ObjectOutputStream stream) throws IOException {
          stream.defaultWriteObject();
          SerialUtilities.writeShape(this.legendArea, stream);
      }
  }
  